Butter

Make your own. Takes a while, but you can guarantee that there is no salt that way

Any retailer of your choice that does organic unsalted butter should be okay

Asda do their own unsalted butter so I imagine other supermarkets do

hmm, have you tried looking for unsalted butter or maybe even a dairy-free spread? those might be good options for your little one! here's what the 'Heal App' says.... "It's great that you're exploring options for your little one! For a low-salt option, look for unsalted butter, as it typically contains no added salt. You might also consider using a dairy-free butter alternative that is specifically labeled as low-sodium or salt-free, which can provide a similar taste and texture without the added salt. Make sure to introduce it gradually and monitor for any reactions, especially since you're on the dairy ladder. Have you already tried any dairy products, and how did your little one respond to them?